Interesting. Haven't tried it yet myself, but some folks on the AMD forum said it helped boot time a bit. Use at your own risk of course. 2nd article down: ------------------ http://theinquirer.net/?article=24749 "Subject: Microsoft claims Longhorn will be, er, faster The only reason why its faster is they added a superfetch feature to the prefetcher. If you look at the key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\Prefetcher you will notice in windows xp EnablePrefetcher = 3 and you will notice in windows longhorn EnableSuperfetch = 1 Well, guess what? You can put the EnableSuperfetch = 1 in windows xp and get the same speed. Wow, Microsoft just added a feature that was already there in xp."